Abstract
AbstractThe reduction processes of anodic PbO2 films formed on Pb‐Sb alloys in 4.5 mol.dm−3 H2SO4 solution at 1.4 V(vs. Hg/Hg2SO4) for 1 h have been investigated by photocurrent method, chronoamperometry, linear sweep voltammetry as well as X‐ray diffractometry. It was found that the reduction of most of the β‐PbO2 and part of the α‐PbO2 to PbSO4 can be completed within 1 s between 0.9 V and 1.0 V(vs. Hg/Hg2SO4) and proceeds much faster than that of the remaining α‐PbO2 into photoactive α‐PbOx (1 < x < 1.4). The presence of antimony in the alloy retards significantly the reduction of the remaining α‐PbO2 and decreases slightly the band‐gap energy of t‐PbO.
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